* The following theme classes can be applied to the `<span data-toggle="tooltip">` tag: `.theme-default`, `.theme-alt`, `.theme-light` or `.theme-dark`.
* The `data-placement` attribute can be set to the following values: `top`, `right`, `bottom` or `left` and governs the placement of the tooltip with respect to the entry point. It is applied to the `<span data-toggle="tooltip">` tag. The default value is `top`.